Encoder

Abstract

The invention discloses an encoder. The encoder comprises a processor, an incremental encoding track PCB, a conductive metal PCB and an absolute encoding track PCB, wherein the incremental encoding track PCB, the conductive metal PCB and the absolute encoding track PCB are arranged in parallel and are hollow, and multiple pole pairs of incremental coils arranged on the incremental encoding track PCB can output incremental composite voltage signal waveforms of corresponding periods; the absolute coils of the single pole pair arranged on the absolute encoding track PCB can output absolute composite voltage signal waveforms of corresponding periods, and the processor codes the periods of the incremental composite voltage signal waveforms so as to determine absolute mechanical position data of the motor shaft. And the distance between the incremental encoding track PCB and the absolute encoding track PCB is not less than the minimum preset distance, so that the absolute coil has small influence on the incremental coil, the precision of the encoder is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of encoders, in particular to an encoder. Background technique [0002] With the rapid development of industrial automation, the demand for hollow encoders in various industries is increasing. Hollow encoders in the current industrial automation industry mainly use photoelectric encoders or multi-pole magnetoelectric encoders. However, the application environment requirements of photoelectric encoders are extremely strict, and it is difficult to apply to high dust, high vibration and high pollution application environments, and the cost of photoelectric encoders is extremely high, which greatly limits the development of hollow encoders. The magnetic induction scheme adopted by the multi-pole magnetic encoder uses a very weak magnetic field and is easily disturbed by external electromagnetic fields. Although the cost is lower compared with the photoelectric encoder, the accuracy of the position information output by i...

AI Technical Summary

Problems solved by technology

However, the application environment requirements of photoelectric encoders are extremely strict, and it is difficult to apply to high dust, high vibration and high pollution application environments, and the cost of photoelectric encoders is extremely high, which greatly limits the development of hollow encoders.

The magnetic induction scheme adopted by the multi-pole magnetic encoder uses a very weak magnetic field and is easily disturbed by external electromagnetic fields. Although the cost is lower compared with the photoelectric encoder, the accuracy of the position information output by it is lower. also very low

[0003] In the prior art, there are hollow encoders implemented by inductive encoders, which do not have high requirements for the environment. However, when the number of pole pairs of incremental coils in the incremental encoding part of the inductive encoder is small, its accuracy Low, when the number of pole pairs of the incremental coil is large, since the coils of the incremental coding part and the coils of the absolute coding part in the prior art are arranged on the same PCB (Printed Circuit Boards, printed circuit boards), the wiring is difficult will increase, and the coil of the absolute encoding part will have an impact on the coil of the incremental encoding part, which will cause interference harmonics in the incremental encoding part, resulting in an increase in the difficulty of simulation and deviation correction, and the accuracy of the encoder. lower

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